Susanne Hempel, PhD, is a senior behavioral scientist at the RAND Corporation and a professor at the Pardee RAND Graduate School. She is the co-director of the Southern California Evidence-based Practice Center, leading contracts for the Agency for Healthcare Research and Quality (AHRQ). She carries out systematic reviews in healthcare research and methodological projects aiming to improve evidence syntheses. Hempel teaches systematic review methodology and applied psychometrics. She lives in Los Angeles, CA.